Environmental Engineering Reference
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Figure 7-30. Calculated contours of sound pressure level around a five-row example
array for the one-third-octave band at 1000 Hz.
(a = 0.54 dB/100 m) [Shepherd and
Hubbard 1986]
A-Weighted Composite Spectra
Figure 7-31 illustrates the effects of A-weighting the composite sound spectrum from
the representative wind power station. Predicted sound spectra for the array are compared
with equivalent spectra for a single machine (Figure 7-24). At large distances, the midrange
frequencies dominate the A-weighted spectrum for both the single turbine and the array.
Figure 7-31. Reference and A-weighted noise spectra for the representative 124-
turbine wind power station and for a single wind turbine
[Shepherd and Hubbard 1986]
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